Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddadbd4f676e0043…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 08:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1cfa9958facf6f8eca230f141c1edf81 SHA-1: e4c8bb65452b24087d11f6c7446e55829c0d470b SHA-256: ddadbd4f676e0043afa6f79f6f08e584821e426cb0a7df40cc347153095eed81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic indicates it's a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://jujucuisine.com/userfiles/file/zinobonuj.pdf In PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/gawasekadezefirolep.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/bokana.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/zepularodopopodego.pdfIn PDF document text
    • http://prompol.com/media/file/dilitiwop.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/dadilumivazujutekumate.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/letek.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109080235477447.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/nadutexubokawomome.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/83672037211.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/kasawunofoxorajabiver.pdfIn PDF document text
    • http://rts-3.ru/upload/files/50300297699.pdfIn PDF document text
    • https://thehouseproduction.net/file/11066685304.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/52599643512.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/27728344680.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210908/16310535115966.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/73398316367.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/61484807592.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/55745778396.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/saxibatemawu.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/tamasibiwiminiw.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/43971837965.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/12082580226.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/42369492638.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/70921401497.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/zelotelimilavuvutaxov.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1914042eb---gemasutagetuta.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9114ad92e5bf86e70ebe6b8aaff0bd2c/gutevidalifukomipot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=trucchi+asphalt+8+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 10748 bytes
SHA-256: 0cbce2fb8cefdcff9a9ca739af8c213c39baf29d924c0924d25cc1044d2f10b0
font_01_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 19056 bytes
SHA-256: 228cfe4bf961aa137b8e5d4990841c064668fdf863165f63adf1ed78da5ccee8